exec/cmd.py: add tests (needs configured sudo)

exec/test_cmd.py

@@ -0,0 +1,70 @@
+import logging
+import os
+import pwd
+import subprocess
+
+from .cmd import run_cmd, run_root_cmd, generate_cmd_su
+
+
+def get_username(id: int):
+    return pwd.getpwuid(id).pw_name
+
+
+def run_func(f, expected_user: str = None, **kwargs):
+    current_uid = os.getuid()
+    current_username = get_username(current_uid)
+    target_uid = current_uid
+    result = f(['id', '-u'], capture_output=True, **kwargs)
+    assert isinstance(result, subprocess.CompletedProcess)
+    result.check_returncode()
+    if expected_user and current_username != expected_user:
+        target_uid = pwd.getpwnam(expected_user).pw_uid
+    result_uid = result.stdout.decode()
+    assert int(result_uid) == target_uid
+
+
+def run_generate_and_exec(script, generate_args={}, switch_user=None, **kwargs):
+    "runs generate_cmd_su() and executes the resulting argv"
+    if not switch_user:
+        switch_user = get_username(os.getuid())
+    cmd = generate_cmd_su(script, switch_user=switch_user, **generate_args)
+    logging.debug(f'run_generate_and_exec: running {cmd}')
+    return subprocess.run(
+        cmd,
+        **kwargs,
+    )
+
+
+def test_generate_su_force_su():
+    run_func(run_generate_and_exec, generate_args={'force_su': True})
+
+
+def test_generate_su_force_elevate():
+    run_func(run_generate_and_exec, generate_args={'force_elevate': True}, expected_user='root', switch_user='root')
+
+
+def test_generate_su_nobody_force_su():
+    user = 'nobody'
+    run_func(run_generate_and_exec, expected_user=user, switch_user=user, generate_args={'force_su': True})
+
+
+def test_generate_su_nobody_force_su_and_elevate():
+    user = 'nobody'
+    run_func(run_generate_and_exec, expected_user=user, switch_user=user, generate_args={'force_su': True, 'force_elevate': True})
+
+
+def test_run_cmd():
+    run_func(run_cmd)
+
+
+def test_run_cmd_su_nobody():
+    user = 'nobody'
+    run_func(run_cmd, expected_user=user, switch_user=user)
+
+
+def test_run_cmd_as_root():
+    run_func(run_cmd, expected_user='root', switch_user='root')
+
+
+def test_run_root_cmd():
+    run_func(run_root_cmd, expected_user='root')